perl run two system commands error - perl

Question

So in my script I need to make to calls to unix, and I do it via the system command like so:
system "bash -i -c 'addmothernode'";
...
perl code ...
...
system "bash -i -c 'addnode -ip=$_'";
However, whenever I run both of these commands in the same script, for some reason my process is stopped like this:
[1]+ Stopped perl boot.pl
And the script can only be finished when I run fg %1. When I only have one of these system calls in, the perl script finishes successfully. But I need both commands because they depend on each other. Anyone have any ideas about what's going on? Thanks!
UPDATE:
A lot of answers below are saying I don't need to use bash -i to run a system command, and I know typically this is true but I need to use aliases that I have created and if I do not use this the aliases won't be recognized. So I do need bash -i.

Answer 1

This problem is unrelated to perl. You can easily reproduce the situation if you start two bashes in the interactive mode (-i) one after another:
$ cat 1.sh
bash -i -c 'sleep 1'
bash -i -c 'sleep 1'
$ bash 1.sh
[1]+ Stopped bash 1.sh
Of course it would be better to run bash in the non-interactive mode (without -i) or run the program directly, without bash, but if you need for some reason bash -i you can protect its run with setsid:
$ cat 1.sh
setsid bash -i -c 'sleep 1'
setsid bash -i -c 'sleep 1'
echo done
$ bash 1.sh
done

Answer 2

The bash -i means run an interactive shell; so you have two shells both reading from the terminal.
Try removing the -i options.

Answer 3

system "addmothernode";
should work.
To execute a command, bash is not needed. The Perl system function is like the system C function, it calls by default sh.
man system
exec
The standard to which the caller conforms determines which shell is used. See standards(5).
Standard Shell Used
______________________________________________________________
1989 ANSI C, 1990 ISO C, 1999 ISO C, /usr/xpg4/bin/sh
POSIX.1 (1990-2001), SUS, SUSv2, SUSv3,
XPG4
POSIX.1 (1988), SVID3, XPG3, no standard /usr/bin/sh
specified